This is a new mesh recolour, and means that you will need to download the particular mesh itself in order for this to show up in your game. See the Meshes Needed section or read the text for more information.

Three new gothic outfits for your adults.

The first one is a Maxis Recolor, you do not need any mesh.
It's a whole outfit. It was actually inspired from a H&M dress that I saw, and I really liked it, so I decided to make it for the Sims. You can download it separately in the zip called "Gothic01".

The second outfit it NOT a WHOLE outfit. It's a top AND a bottom. The top is made using HystericalParoxysm's Alpha Editable Dress Top Mesh. You can find it here.
The bottom is a short skirt (even if it doesn't appear to be). You must download the mesh by Mr.Bill, download it here.
You can download it separately in the zip called "Gothic02".